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Why do I get this error: _CastError (Null check operator used on a null value)

March 9, 2023

I have a column like this:

  Column(children: [
    product.videos![product.videoIndex].videoUrl != null &&
            product.videos![product.videoIndex].videoUrl != ""
        ? VideoPlayerWidget(
            videoAddress: product.videos![product.videoIndex].videoUrl)
        : Image.asset('assets/images/video-placeholder.jpg'),
  ]),

And I get this error:

_CastError (Null check operator used on a null value)

I know that the variables may be null and that’s the reason I put them within a null check if statement, but I don’t know why do I get the null check error and how can I pass that?

The Flutter forced me to put ! after null variables, then it gives me error because of that!

>Solution :

Looks your product.videos itself null. So change ! to ? in if condition.

Column(children: [
    product.videos?[product.videoIndex].videoUrl != null &&
            product.videos?[product.videoIndex].videoUrl != ""
        ? VideoPlayerWidget(
            videoAddress: product.videos![product.videoIndex].videoUrl)
        : Image.asset('assets/images/video-placeholder.jpg'),
  ]),